Planar waveguides were fabricated by diffusing Zn into MgO:LiNbO3 and LiNbO3. Zn-diffused waveguides in MgO:LiNbO3 guide both the ordinary and extraordinary polarization and have propagation losses at 633 nm in the range of 0.4–1.2 dB/cm. Single-beam-induced in-plane scattering due to photorefractive damage was not observed at 515 nm up to intensities of as much as 90 kW/cm2.
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